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HTTP Headers

Request

You can access the headers of the incoming HTTP Request at:

  • pageContext.headers
  • pageContext.headersOriginal

pageContext.headers is a string object (Record<string, string>) normalized by Vike, and pageContext.headersOriginal is the original object (unknown) provided by the server.

For example:

// pageContext.headers
{
  'accept-encoding': 'gzip, br',
  'accept-language': 'en-US,en;q=0.9,fr;q=0.8',
  'cache-control': 'max-age=0',
  connection: 'Keep-Alive',
  cookie: 'username=brillout; admin=true'
}
 
// pageContext.headersOriginal
[
  ['Accept-Encoding', 'gzip, br'],
  ['Accept-Language', 'en-US,en;q=0.9,fr;q=0.8']
  ['Cache-Control', 'max-age=0'],
  ['Connection', 'Keep-Alive'],
  ['Cookie', 'username=brillout; admin=true']
]

You can also have the headers as a standard Headers object by using new Headers():

// The `new Headers()` constructor is available in all common JavaScript environments:
// Node.js, Cloudflare Workers, browsers, ...
const headers = new Headers(pageContext.headers)

All values are merged, and you can get the list of values as an array (string[]):

const acceptLanguage = pageContext.headers['accept-language']
  .split(',')
  .map(v => v.trimStart())

For getting the list of cookie values, you usually use a cookie parser (e.g. cookie-parser).

The pageContext.headersOriginal value is defined at your renderPage() integration:

import { renderPage } from 'vike/server'
 
// Server middleware
app.get('*', async (req) => {
  const pageContextInit = {
    urlOriginal: req.url,
    headersOriginal: req.headers
  }
  const pageContext = await renderPage(pageContextInit)
  // ...
})

Response

The headers of the HTTP Response that is generated by Vike is available at pageContext.httpResponse.headers.

import { renderPage } from 'vike/server'
 
// Server middleware
app.get('*', async (req) => {
  // ...
  const pageContext = await renderPage(pageContextInit)
  // HTTP Headers of the HTTP Response.
  const headers = pageContext.httpResponse.headers
})

See API > renderPage().

It's an array of string tuples ([string, string][]) such as:

[
  ['Content-Type', 'text/html;charset=utf-8'],
  ['Cache-Control', 'no-store, max-age=0']
]

You can also have the headers as a standard Headers object by using new Headers():

const pageContext = await renderPage(pageContextInit)
// The `new Headers()` constructor is available in all common JavaScript environments:
// Node.js, Cloudflare Workers, browsers, ...
const headers = new Headers(pageContext.httpResponse.headers)

See also